Barometer



N. PETERS. PHDTOMTNOGRAPHER. WASHINGTON. D C.

UNITED STATES PATENT OFFICE.

JOSEPH 'I'. LARGE, OF BROOKLYN, NEW YORK.

BAROMEIER.

Speccaton of Letters Patent No. 32,836, dated July 16, 1861.

To all whom it may concern:

Be it known that, JosEPI-r T. LARGE, of Brooklyn, Long Island, in the State of New York, have invented a new and useful Improvement in Barometers; and I do hereby declare that the following is a full and eX- act description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon.

The nature of my invention consists in a mode of constructing barometers, whereby the liability of breaking, bursting or leaking, from expansion or sudden concussion of the mercury during transportation is entirely prevented.

The principle upon which my improvement is based, is this, that I construct the mercury cups or cisterne atbottom of barometer tubes with india rubber or elastic bags, worked by a mechanical arrangement so as to render the instrument portable and thereby preventing the least likelihood of bursting or leaking of the bag (attached at bottom, and forming part of the mercury cup or receptacle for the quicksilver) from expansion or sudden concussion of the mercury, while in transportation.

Barometers in present use are constructed with wood or iron mercury cups, or boxes with leather bags at bottom, which are always,` breaking, bursting or leaking from expansion of the mercury, or sudden concussion of the mercury during transportation. Now by my improvement I obviate the least tendency in these mishaps in the use of barometers.

To enable others skilled in the manufacture of barometers to make and use my invention, I will proceed to describe its construction and operation, reference being had to the annexed drawings making part hereof, and to the letters of reference marked thereon, in which" Figure 1, represents a `part of barometer, with improvements attached, showing the position of elastic bag F, and cushion or mercury cut-olf G5 at the bottom of tube 79, when the instrument is portable and ready for transportation. Fig. 2, is a sectional view of same, showing the position of the bag F, with cushion or mercury cut-olfl G, when the instrument is in use. Fig. 3, is partially a side View showing the manner brass plate S, is attached with slot C, and notches f, and g, thereon in which the thumb screw B, is worked, in the adjusting of the bag F with cushion Gn Fig. 11, represents a different arrangement as shall be hereinafter described.

A, is a vertical lever worked laterally, up' and down by a thumb screw 13, through slot 0, and a iiXed knob E, which is attached by screws on facing of instrument directly under the center of mercury cup or cistern H, as shown in drawing. The end of that part of the lever A-D, as worked through E, is formed in the shape of an acorn, as shown in Fig. 2, letter VVJ upon which the bag F, is drawn tightly over, and secured by the winding around on its lower part, a string or thread forming a cushion, or mercury cut-oft1 Gr, on interior of mercury cup or cistern IL for the purpose as shall be hereinafter described.

Fig. 3 shows the brass plate S, with notches f, and 9, at side of slot 0, in which the thumb screw B, is slid into in the forcing up and down of the lever A, in the adjusting of the bag F, with cushion G, as shall be hereinafter described. I

Fig. 4 represents a dierent arrangement, or device but for the same purpose and producing the same result as the arrangement above specified in which P, is a swivel, with an acorn end U, secured to the bag F, in the same way as D, shown in Figs. 1, and 2, and worked by a thumb screw I, through a plate or standard R, afiixed at the end on bottom of barometer by screws e, c, at .I, Fig. 1. On this screw 1, are two pins la and 7c, for regulating of swivel, in the adjusting of the bag F, with cushion or mercury cut-off G, as shall be hereinafter described.

Operation is as follows: Holding the barometer at an angle of 45 degrees slightly unscrewing the thumb screw 13, and forcing the lever A, down to, and in notch f, marked open then screwing fast B, the barometer is then ready to be hung up for use. To make the barometer portable, hold it in the angle as above stated, and unscrewing B and forcing the lever A, up to and in the notch g, marked, portable, which brings the cushion or mercury cut-oftl G, up at the same time to the tube p, air tight, so that the tube is filled with quick-silver from bottom to top and cannot return .to thisJ body 'of the quicksilver in cup or cistern H, thereby preventing any sudden concussion of the quick-silver against the bag fFf When shaken by the hand, or during transporta-A tion.

The cushion or mercury cut-olif G, an-

lever A, When Worked by the screw 'B,

also leaving the confined quick-silver free in cistern IL and giving on any sudden; concussion of the `mercury during transpor-g` tation, thereby preventing the bursting or` leaking of the bag, or breaking of the cis tern as is the case with barometers noW in use, also a perfect lvacuum 1n the tube,;

when barometer is in use.

In the arrangement of Fig. 4, screvvup L until the pin z, reaches close up to@ R, this forces up the cushion or mercury' cut-olf inthe same osition and-read fori the Same vpurpose as described 'and shovn at G, Fig. l. Otherwise unscrew I, until the pin 712, is brought down close to R, the barometer is then ready to be hung up for use as hereinbefore described.

This improvement is adapted to all kinds of barometers, either mountain-marine or house.

Having thus fully described the nature and use of my improvement I will proceed to state v.vvhat Iclaim and desire to secure by Letters Patent'. y

What I claim as my invention and desire :to secure by Letters Patent is- The arrangement and combination of the elastic lcistern bag F, acorn-shaped knob WV, lever A, thumb-screw B, slot C, `and notches f, g, .substantially in the manner and lfor the purpose herein specified.

In testimony whereof I have hereunto set my vhand and seal.

JOSEPH T. LARGE. 

